Blurb::
Choice of error metric to satisfy 

Description::
The cross-validation score that the auto-refinement routine seeks
to satisfy is based on an error metric. Any of the surrogate diagnostic 
\ref model-surrogate-global-metrics may be used. These include:
<ul>
 <li>root_mean_squared</li>
 <li>mean_abs</li>
 <li>rsquared</li>
 <li>sum_squared</li>
 <li>mean_squared</li>
 <li>sum_abs</li>
 <li>max_abs</li>
</ul>
<b> Default Behavior </b>
The default metric is the the root mean squared error ('root_mean_squared').

Topics::

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